Extracted UsbService as interface.

chrome/browser/extensions/api/usb/usb_api.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_USB_USB_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_USB_USB_API_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 72 matching lines @@
   std::vector<scoped_refptr<usb_service::UsbDeviceHandle> > device_handles_;
   scoped_ptr<extensions::api::usb::FindDevices::Params> parameters_;
 };
 
 class UsbGetDevicesFunction : public UsbAsyncApiFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("usb.getDevices", USB_GETDEVICES)
 
   UsbGetDevicesFunction();
 
-  static void SetDeviceForTest(usb_service::UsbDevice* device);
-
   virtual bool Prepare() OVERRIDE;
   virtual void AsyncWorkStart() OVERRIDE;
 
  protected:
   virtual ~UsbGetDevicesFunction();
 
  private:
   void EnumerationCompletedFileThread(
       scoped_ptr<std::vector<scoped_refptr<usb_service::UsbDevice> > > devices);
 
@@ skipping 202 matching lines @@
 
   virtual bool Prepare() OVERRIDE;
   virtual void AsyncWorkStart() OVERRIDE;
 
  private:
   scoped_ptr<extensions::api::usb::ResetDevice::Params> parameters_;
 };
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_USB_USB_API_H_